"This seems highly unusual, if you ask me. I've tried to find a natural cause for it. These pouches resemble the unusual cloud element called mammatus, but mammatus is only present on the underside of a cumulonimbus in warm weather, and this was the underside of a thin, flat stratus in December.* There is also the blurry, vibrating characteristic which isn't easily accounted for. I wondered if more was involved here than met the eye. I began to notice that our clouds were a whole lot more bizarre than I could have thought possible. I started to see how many (most!) are being created from chemtrails. The beautiful cumulus clouds which filled the skies of my childhood were nonexistent. I realized I hadn't seen a single cumulonimbus all summer. Most of the clouds over Duluth are fake! I know that sounds crazy."from BariumBlues.com